KATG.com is an app I created for the popular comedy podcast Keith and The Girl
It has:
A Shoutcast client for listening to live shows
A feedback system so users can send in their thoughts during live shows
An events calendars so user can keep up with show times and events
A past shows archive with search, show notes, pictures and streaming playback.
A twitter client so users can see Keith and The Girls tweets and also tweets by their fans
A list of useful links related to the show